Grinding machine



Nov. 17, 1936. G. w. BINNS ET AL. 2,060,785.

GRINDING MACHINE Filed Aug. l0, 1934 5 Sheets-Sheet 1 12' 7 42 6f if fa 44 76 2/ Y; c o J2 5 ff IHIHHIIHII IIIHHIII INVENTOR.

W r 1M ATTORNEY.

Nov. 17, 1936; w G. w. BINNS ET AL 2,060,785

GRINDING MACHINE Filed Aug. 10, 19-34 3 Sheets-Sheet 2 (flaw/M0 007 ATTORNEY.

Nov. 17, 1936. G. w. BlNNS ET AL 2,060,785

GRINDING MACHINE Filed Aug. 10, 1954 :5 Sheets-Sheet 3 I/// I .2 Isi -77 11 771111 ATTORNEY.

Patented Nov. 17, 1936 UNTED STATE PATENT OFFIQE GRINDING MACHINE Application August 10,

11 Claims.

This invention relates to improvements in grinding machines and particularly to improvements in centerless grinders.

One of the principal objects of the present invention is the provision of an improved centerless grinder wherein the axis of the work is disposed at right angles to the axis of the grinding wheel for producing work of substantially circular form in cross section.

Another object of the invention is the provision of an improved centerless grinder for expeditiously producing formed work pieces of circular cross section, such as chamfering the ends of cylinders, bushings and the like.

Another object of the invention is the provision of improved means for use with grinding machines for supporting and controlling the rotation of the work while being operated upon.

It is also an object of this invention to provide a grinding machine in which the work pieces can be readily inserted, rotated, fed and retracted from the grinding wheel for thereby producing a maximum of work pieces with a minimum of setup and lost time.

Other objects and advantages of the present invention should be readily apparent by reference to the following specification, considered in conjunction with the accompanying drawings forming a part thereof and it is to be understood that any modifications may be made in the exact structural details there shown and described, within the scope of the appended claims, without departing from or exceeding the spirit of the invention.

In the drawings:

Figure 1 is a front elevation of a grinding machine embodying improvements of this invention.

Figure 2 is a top plan view of the machine shown in Figure 1.

Figure 3 is a staggered sectional and elevational View as seen from line 33 on Figure 2.

Figure 4 is a fragmentary longitudinal, sectional view as seen from line 4-4 on Figure 2.

Figure 5 is a horizontal sectional view as seen from line 55 on Figure 1.

Figure 6 is a sectional view as seen from line 66 on Figure 2.

Throughout the several view of the drawings similar reference characters are employed to denote the same or similar parts.

As was mentioned above, this application pertains to improvements in centerless grinders, particularly to such" a machine wherein the work piece is rotated with its axis disposed normally or at right angles to the axis of rotation of the 1934, Serial N0. 739,232

grinding wheel and its spindle. The specific arrangement shown in the drawings is utilized for beveling the ends of bushings to provide a lead for said bushings for pressing into a hole or the like. It is to be understood, however, that the 5 invention is not to be limited to this particular adaptation since it is readily conceivable that the body of the bushing may be ground or finished instead of merely the ends thereof.

Specifically, a machine of this invention would comprise a bed having rising therefrom a pedestal bearing ii in which is rotatably journaled a spindle carrying on its outer or free end a grinding wheel l2. The Wheel i2 is enclosed by a suitable guard F3 for confining the coolant usual with grinding machines of this type. Any suitable or desirable means may be utilized for effecting the rotation of the grinding wheel and its spindle which is effected at a high grinding rate of speed.

The bed Iii extending from the pedestal bearing 4 i is provided with a dovetail guide It, clearly illustrated in cross section in Figure 3. Mounted on the guideway I4 is a work supporting and controlling unit, comprising a slide l 5 having formed in its under surface a guideway complementary to the dovetail guide M. The slide 85 is adapted to be actuated toward and from the grinding wheel, for which purpose it has rising at one end thereof a lug or boss it into which is secured a nut ill in threaded engagement with an adjusting screw E8. The screw i8 is rotatably journaled against axial movement in a bracket I9 secured to an extension 28 of the bed Ill. The screw !8 projects beyond the bracket 19 to which projection is secured in any desirable manner a pilot or hand wheel 2! utilized for efiecting the rotation of the screw 58. The slide it is adapted to be definitely spaced from the wheel I2, as will later be made clear, and is located or clamped in said position by means of clamp screws 22, which as is well understood, impinge on the sides of the dovetail guide l4.

The slide it has rising from its forward end a face plate 23, to the upper end of which is screwed a work support or blade 24. With the particular application illustrated in the drawings the blade 24 adjacent the grinding wheel I2 is skived or inclined as at 25 in a direction away from the operative face of the wheel so as to pro- 50 vide clearance therefor.

To the forward face of the face plate 23 there is adjustably secured'a pair of brackets 26 and 2'! located respectively on opposite sides of the wheel [2. The brackets 26 and 21 are substan- 55 tially L-shaped in cross section, and respectively to the upper flanges 28 and 29 thereof is adjustably secured blocks 30 and 3|. The block 30 is substantially U-shaped in form, having projecting therefrom arms 32 and 33. The said arms 32 and 33 are provided with aligned bores in which is rotatably journaled an axle or shaft 34 carrying a roller 35. It will be appreciated from Figure 3 that the block 39 and roller 35 are adjustable toward and from the grinding wheel l2 by means of screws 36 which extend through elongated apertures in the bracket flange 28. At the same time the bracket 26 and parts carried thereby, including the roller 35, are vertically adjustable through the screw 31 and the elongated aperture through which it passes.

The block 3| is provided therein with a bore 38 receiving the cylindrical sleeve or shank 39 projecting from yoke member 49. The yoke 49 has its arms 4! and 42 pierced with bores in axial alignment through which extend the shaft or axle 43. Mounted on said shaft or axle 43 is a roller 44 opposed to the roller 35.

The cylindrical yoke sleeve or shank 39 is bored to receive a spring 45 which abuts on one end with the base of the sleeve bore and on the other end with the base of the block bore 38. The spring 45 tends to shift the yoke 49 and roller 44 to the left as seen in Figure 3, but this movement is definitely limited by a pin 46 projecting inwardly from the block 3 i, which pin contacts with one end of an elongated aperture 47 formed in one side of the cylindrical sleeve or shank 39. It is believed this construction is readily understood from a study of Figure 3. The block 3! and roller 44, similar to the block 30 and roller 35, is adjustable toward and from the grinding wheel l2 and held in adjusted positions by clamp bolts 48 passing through elongated apertures formed in the bracket fiange 29. Similarly, the bracket 21 is vertically adjustable and secured in said positions by means of clamp screws 49 which extend through suitable elongated perforations formed therein. Secured to the inner end of the slide face plate 23 is a bracket 59 from which projects a lug 5| carrying a vertically extending trunnion 52. The trunnion 52 has mounted thereon on anti-friction bearings 53 a carrier 54. The carrier 54 is utilized for effecting the feed of the work relative to the grinding wheel and carries the means for effecting and controlling the rotation of said work. As seen in Figure 5, the carrier 54 has journaled therein on suitable anti-friction bearings a worm shaft 55 and integral therewith or secured thereto at one end thereof is a worm 56 meshing with a worm wheel 57. The other end of the worm shaft 55 has keyed or otherwise secured to it a sheave 58, here shown as of the V belt type, and of two steps whereby the shaft 55 may be rotated at either of two different speeds. The sheave 58 has trained thereabout a V belt 59, in turn extending about a pulley or sheave 69 secured to a motor shaft 5| of electric motor or prime mover 62. The sheave 69 has two steps which cooperate with the steps of the pulley or sheave 58.

The motor 52 is secured to a slide 63 mounted for sliding movement on an extension 64 projecting from the carrier 54. The slide 63 is utilized for shifting the motor to vary the tension in the belt 59 and to take up slack therein. In order to effect a movement of the slide 63 the carrier 54 at the end of the extension 64 is provided with a small bracket 65 in which is rotatably journaled an adjusting screw 36, having a threaded engagement with the slide 63 and wherefore rotation of the screw 66 shifts the slide 63.

The worm wheel 57, as seen in Figure 4, is keyed or otherwise secured to a shaft 6'! rotatably journaled in anti-friction bearings supported by the carrier 54. The shaft Bl is vertically disposed and projects beyond the carrier 54 to receive a Wheel 88 which has a relatively hard though nonscratching tire 69. The wheel 68 lies with its axis in alignment with the wheel I2 as clearly illustrated in Figure 2. From this it will be seen that the wheel 68 with the opposed rollers 35 and 44 form a three-sided throat in which the work 10 is disposed.

In order to open up the throat for the removal of a finished work piece and the insertion of an unfinished one the carrier is oscillated about the axis of the trunnion 52 and carries with it all the parts above described as carried and supported thereby. In order to effect this oscillation of the carrier 54 it has projecting therefrom a lever or handle H located in front of the machine where the operator normally takes his station.

The operation of the machine is as follows:

The operator upon standing in front of the machine grasps the handle I! and actuates the carrier 54 in a counterclockwise direction, to the right as seen in Figure 2. This draws the wheel 68 away from the grinding wheel I2 and fully exposes the supporting blade 24. A work piece, such as a pin or bushing 10, is disposed on the said blade 24 between the grinding wheel and the feed and control wheel 68. The operator then through the handle ll actuates the carrier in a clockwise direction to cause the feed and control wheel 58 to engage the work 10 and slide same relative to the blade 24 into contact with the wheel I2. This movement is initially resisted by the rollers 35 and 44, which, as seen in Figure 4, extend substantially the full length of the work and amply laterally support the work during the grinding operation. Continued movement of the carrier 54 through the wheel 68 and work 10 forces the roller 44 outwardly by compressing the spring 45. The parts are so arranged that the roller 44 continues to move until the end of the elongated perforation in the sleeve or shank 39 engages the pin 46, as shown in Figure 3. At this time the work has been fed toward the grinding wheel a sufficient distance to reduce same to its final size and form. The parts are allowed to remain in this position for a short interval of time to permit a sparking out between the wheel and the work, whereupon the carrier is again actuated in a counterclockwise direction to draw the feed and control wheel from the work. As soon as this takes place the spring 45 expands for shifting the roller 44 toward the stationary roller 35, thereby removing the work from the wheel a distance to effect a clearance therebetween, whereupon the finished work piece is withdrawn from the machine and an unfinished one substituted therefor.

It should be noted that the machine when initially put in use may have a grinding wheel with a plane face but this face is soon worn to the form shown in the drawings, namely, concaved. In this particular application, the said operative face of the grinding wheel need not be trued because the rotation of the work in wiping completely across the operative face of the wheel maintains same in a relative true sharp condition for producing work pieces with the desired finish thereon.

The face of the wheel will naturally wear and would in time become so small as to effect substantially no grinding on the work piece. To compensate for this wheel wear the clamps 22 are released and the pilot or hand wheel actuated to feed the slide l and parts carried thereby toward the grinding wheel the desired amount. By this arrangement the wheel I2 is utilized until its diameter becomes too small to be practical.

It will be appreciated that adjustment of the motor 62 through the slide 63 for tensioning the belt 59 carries with it the motor sheave 60. Enclosing the sheaves and the belt 59 is a guard 12 which is secured to a plate 13 secured to the rear face of the carrier 54, as clearly shown in Figure 5, the connection between the guard 12 and plate 13 being bolts 14 extending through suitable elongated perforations. From this it will be seen that the angular position of the guard may be readily adjusted to compensate for the inclination of the belt 59 as effected by the adjustment of the motor.

What is claimed is:

1. A grinding machine for the purpose described including a rotatable grinding wheel, a slide disposed in opposition to the periphery of the wheel, a terminal work engaging member carried by the slide, a pair of lateral work en gaging members adjustably mounted on the slide and spaced for reception of the work and grinding wheel therebetween, a rotatable control member for lateral engagement with the work, said member having its axis disposed substantially in the plane of the grinding wheel, means supporting the control member on the slide for pivotal movement relative thereto, and means for moving the control member into and out of peripheral engagement with the work piece for controlling the rotation and presentation thereof in operative relation to the grinding wheel.

2. In a grinding machine of the .class described the combination of a bed, a grinding wheel rotatably mounted on the bed, a work supporting and rotation controlling unit mounted on said bed including a slide, a work support on the slide for supporting a work piece with its axis disposed in substantially tangential relation to the periphery of the grinding wheel, a rotatable work rotation control and feeding wheel on said slide for shifting the work relative to the support toward the grinding wheel, a lateral supporting roller disposed on each side of the work and forming with the work rotation control wheel a work receiving throat, and means yieldingly supporting one of said rollers whereby movement of the work toward the grinding wheel effects a retraction thereof to permit engagement of the work and grinding wheel.

3. In a grinding machine of the class described the combination of a bed, a grinding wheel rotatably mounted on the bed, a work supporting and rotation controlling unit mounted on said bed including a slide, a work support on the slide for supporting a work piece with its axis disposed in substantially tangential relation to the periphery of the grinding wheel, a rotatable work rotation control and feeding wheel on said slide for shifting the work relative to the support toward the grinding wheel, a lateral supporting roller disposed on each side of the work and forming with the work rotation control wheel a work receiving throat, and means yieldingly supporting one of said rollers whereby movement of the work toward the grinding wheel effects a retraction thereof to permit engagement of the work and grinding wheel, and whereby the shiftable roller through its yielding means withdraws the work from the grinding wheel at the conclusion of the grinding operation and means for effecting movement of the control wheel with respect to the lateral supporting rollers.

4. In a grinding machine of the class described the combination of a bed, a grinding wheel rotatably mounted on the bed, a Work supporting and rotation controlling unit mounted on saidbed including a slide, a work support on the slide for supporting a work piece with its axis disposed in substantially tangential relation to the periphery of the grinding wheel, a rotatable work rotation control and feeding wheel on said slide for shifting the work relative to the support toward the grinding wheel, a lateral supporting roller disposed on each side of the work and forming with the work rotation control wheel a work receiving throat, means yieldingly supporting one of said rollers whereby movement of the work toward the grinding wheel effects a retraction thereof to permit engagement of the work and grinding wheel, and whereby the shiftable roller through its yielding means withdraws the work from the grinding wheel at the conclusion of the grinding operation, and means for shifting the slide and parts carried thereby toward the grinding wheel to compensate for wheel wear.

5. In a grinding machine of the class described the combination of a bed, a grinding wheel rotatably mounted on the bed with its axis extending transversely thereof, a slide on the bed, a work support on the slide for supporting a work piece for rotation with its axis extending substantially tangential to the grinding wheel, a rotatable work rotation control wheel adjacent the work support for effecting and controlling the rotation of the work, a carrier on the slide for supporting the work rotation control wheel a vertically disposed pivot on the slide for the carrier, means on said carrier for effecting the rotation of the control wheel, and means for manually oscillating the carrier and parts carried thereby about said pivot to effect a feeding movement of the work relative to the support toward the grinding wheel during rotation of the work.

6. In a grinding machine of the class decribed the combination of a bed, a grinding wheel rotatably mounted on the bed with its axis extending transversely thereof, a slide on the bed, a work support on the slide for supporting a work piece for rotation with its axis extending substantially tangential to the grinding wheel a rotatable work rotation control wheel adjacent the work support for effecting and controlling the rotation of the work, a carrier on the slide for supporting the work rotation control wheel a vertically disposed pivot on the slide for the carrier, means on said carrier for effecting the rotation of the control wheel, means for manually oscillating the carrier and parts carried thereby about said pivot to effect a feeding movement of the work relative to the support toward the grinding wheel during rotation of the work, and means for actuating the slide and pivot relative to the bed toward the grinding wheel to compensate for wear on the said grinding wheel.

7. In a grinding machine of the class described the combination of a bed, a grinding wheel rotatably mounted on the bed with its axis extending transversely thereof, a slide on the bed, a work support on the slide for supporting a work piece for rotation with its axis extending vertically to the bed, a rotatable work rotation control wheel adjacent the work support for eifecting and controlling the rotation of the work, a pivotally mounted carrier on the slide for supporting the work rotation control wheel, means on said carrier for effecting the rotation of the control wheel, means for manually oscillating the carrier and parts carried thereby about a vertical axis to effect a feeding movement of the work relative to the support toward the grinding wheel, means for actuating the slide relative to the bed toward the grinding wheel to compensate for wear on the said grinding wheel, lateral work supporting rollers disposed on each side of the work and grinding wheel to engage the work and cooperate with the work rotation control wheel in maintaining the axis of the work in prescribed position during the grinding operation and yielding means associated with one of said rolls to permit its movement during the feeding of the work toward the wheel and effect the withdrawal of the work from the wheel at the conclusion of the grinding operation.

8. A machine for effecting beveling of the edge of a roll or the like including a rotatable grinding wheel having its periphery transversely curved in conformity with the shape of the work piece to be beveled, and means for presenting the edge of the work piece in substantially tangential relation to the formed periphery of the grinding wheel, said means including a support for the end of the work piece, a pair of members spanning the grinding wheel and peripherally engaging the work piece for determining the relationship of its axis to the grinding wheel, and a rotatable control member disposed in opposition to said members for effecting rotation of the work piece about the axis determined by the members during the grinding operation.

9. A machine for effecting beveling of the edge of a roll or the like including a rotatable grinding wheel having its periphery transversely curved in conformity with the shape of the work piece to be beveled, and means for presenting the edge of the work piece in substantially tangential relation to the formed periphery of the grinding wheel, said means including a support for the end of the work piece, a pair of members spanning the grinding wheel and peripherally engaging the work piece for determining the relationship of its axis to the grinding wheel, a rotatable control member disposed in opposition to said members for effecting rotation of the work piece about the axis determined by the members during the grinding operation, an oscillatable support for said rotatable control member, and power driven means coupled to the support and oscillatable therewith for effecting power rotation of the rotatable control member.

10. A machine for effecting beveling of the edge of a roll or the like including a rotatable grinding wheel having its periphery transversely curved in conformity with the shape of the work piece to be beveled and means for presenting the edge of the work piece in substantially tangential relation to the formed periphery of the grinding wheel, said means including a support for the end of the work piece, a pair of members spanning the grinding wheel and peripherally engaging the work piece for determining the relationship of its axis to the grinding wheel, a rotatable control member disposed in opposition to said members for effecting rotation of the work piece about the axis determined by the members during the grinding operation, an oscillatable support for said rotatable control member, power driven means coupled to the support and oscillatable therewith for effecting power rotation of the rotatable control member, means for manually oscillating the rotatable control member and its support in a direction toward and from the grinding wheel to move the Work into grinding relation with the wheel, and means for limiting the extent of urge of the work in the direction of the wheel.

11. A machine for efiecting beveling of the edge of a roll or the like including a rotatable grinding wheel having its periphery transversely curved in conformity with the shape of the work piece to be beveled and means for presenting the edge of the work piece in substantially tangential relation to the formed periphery of the grinding wheel, said means including a support for the end of the work piece, a pair of members spanning the grinding wheel and peripherally engaging the work piece for determining the relationship of its axis to the grinding wheel, a rotatable control member disposed in opposition to said members for efiecting rotation of the work piece about the axis determined by the members during the grinding operation, an oscillatable support for said rotatable control member, power driven means coupled to the support and oscillatable therewith for eilecting power rotation of the rotatable control member, means for manually oscillating the rotatable control member and its support in a direction toward and from the grinding wheel to move the work into grinding relation with the wheel, means for limiting the extent of urge of the work in the direction of the wheel, and means for moving the members and Wheel as a unit toward and from the grinding wheel whereby the ultimate extent of work movement is variably determined.

GEORGE W. BINNS. CLEMENT BOOTH. 

